dizziness sign of pregnancy or pms?

S
My period is due in 4 days and I've been feeling nauseous and dizzy!! I've never felt like this before my period. I've been trying for a year and a half so i don't really jump to take a pregnancy test like I used to. I didn't BD much this month... but something feels different. If you've been pregnant have you had this symptom before? Let me know! Thanks ladies.